End liner for grinding mills



April 14, 1942.

M. L. RAHNER END LINER FOR GRINDING MILLS Filed April 10, 1959 2 Sheets-Sheet 1 INVENTOR. MAXWELL L. RAHNER. BY Q ATTORNEY.

April 14, 1942.

M. L. RAHNER END LINERFOR GRINDING MILLS Filed April 10, 1939 2 Sheets-Sheet 2 INV ENTOR. AXWELL LAHNER MAJ, r}

ATTORNEY.

Patented Apr. 14, 1942 END LINER FOR GRINDING M Maxweli'ln Raliner, Hi'ghl'ami la-rk;

Application-April 10, 1939; Serial'No. 267,112

5 Claims: I (Cl; 83-9) This invention relates; to grinding mills and more particularly to improved; end: liners-there.- for, although. certain features thereof. may be employed with equal advantage: for other; purposes.

It contemplates: more especially the: provision of improved end'liners. for grinding-millsto: enable the removal thereof withminimum expenditure of time: and eifort, thereby permitting speedy and unhampered access to the working mechanism and interior of? the.- grinding millzfor interior reconditioning: and replacement-rot parts such asliners; or: even .the end? liners;

Numerous types. of grinding mill, liners. have been proposed and for the most; part these are formed from east material or rolled plates-inter-. posed with lifting members and anchoring: expedients therefon These.- liners and lifting: elements are subjected to severe; wear and? require frequent: replacement. Accessibility totheinterior of the grinding mill is, therefore; an'important consideration and, should: be accomplished with minimum; effort and without entailing: too much time. It has been found that the provision of readily removable end liner plates solves the problem of rendering the interior of grinding mills accessible from the standpoint of. simplify:- ing; housing; liner replacement.

With the teachings of the present invention; the end liner plates are so arranged and con.- structed as to afford speedy detachment thereof without. entailing the usual time, labor andeffort required with the end liner. sector plates of quadrant shapes: Whileexpedients to; render end liner quadrants readily removable have.- heretdfore been proposed, such. have not. been, adopted with any degree of. success because they: appreciablyenhance the cost of end'liners. and require loosely associated endliner sections that are not entirely satisfactory.

One object of the present invention is.- tosimplify the construction and improve. end liner sections. designed to rendersuch more readily re movable.

Another object is to provide, end liner grinding mill segments. of. standard; shapes witha. sine gle intermediary section of special" construction to. afiord the, ready removal thereof for gaining accesstothe interior of grinding. mills.

Still. anotherbbject. is. to provide grinding mill end liners of substantially standard shapes for association with a special and liner segment that is readily removable topermit, remaining sections, to i be. detached without entailing much time. labor or expense;

A further; obiect is: to provide endrliner quad-,- rant's: in association with; an: insert having; parallel side portionstoafiordready removal-.thereof and; provide.v space. to. separate,- the remaining quadrants'or. radial; sectors. I

and=an insert havinggthe; side edges or portions thereof disposed-parallel.- to-each other for permitting the ready removal thereof so that the remaining quadrants are readily detachable.

Other objects and advantages will appear from the following description of an illustrative embodiment of thepresent invention;

In the, drawings-z Figure 1 is a perspective. sectional View of a grinding mill showing a portion of its. interior looking toward the.- feeding-endor open trunnion, the, end. liner seotionsbeing shaped. to embody teachings of the present invention.

Figure 2. is: av perspective view of an endv plate and open mounting trunnion looking from the interior and showing end linersinoperative relation therewith, certain of. the endliner sections being shaped to embo.dy features of the present invention.

Figure. 3 isa fragmentary sectional: view'taken substantially along line -IIIIII of Figure 1'.

Figure. 4 is a. perspectiveview of an. end liner insertembodying features-of the present invention and shown inassembled relation in Figure 2.

Figure 5 is a fragmentary perspective View similar to Figure 2 and showing; modified end liner sections. embodying: features of the presen invention.

Figure 6; ispa fragmentary perspective view of aspecialend-.liner insert shown in assembled relation:in Figure 5;

Figure 7 is a fragmentary perspective; view of an end liner auxiliary insert constituting'a com.- plement of' the insert shown in Figureafi.

Figure 8 is a fragmentary perspective View similar to Figure 2*and showing a still further modified end liner: sections embodying features of the present invention.

Figure 9'isarfragmentaryperspective view of' theqspecial, end linercasingshown in assembled relation in Figurezfig Figure 10 is a fragmentary sectional view of a corner section of a grinding mill showing the internal liner in its relation with an end liner section of the type shown in Figure 9.

The structure selected for illustration comprises a substantially cylindrical shell III of a conventional grinding mill. The shell I6, in ths instance, has its interior lined with a plurality of detachably associated fiat steel rectangular plates II. The substantially fiat rectangular plates H extend for any desired length and width, and merely comprise a component part of the sectional liner that extends longitudihally for the length of the grinding mill shell II). To this end, the substantially fiat liner plates II extend longitudinally of--each other so that their ends I2-I3 are in adjacent contact (Figure 3) and the number depend upon the requirements of handling and the length of the particular grinding mill shell I6 together with the most efiicient unit size thereof.

A plurality of frusto-conical apertures I4, in this instance two, are provided along a longitudinal median line of each plate II to receive anchoring fasteners such as threaded bolts I6 having correspondingly shaped and sized heads I]. The frusto-conical heads H of the threaded fastener bolts I6 and the apertures I4 are preferably provided with complemental inter-engaging means more particularly illustrated and described in my copending application serially numbered 256,679 and filed February 16, 1939, thereby precluding the fasteners I6 from turning as their nuts H are turned down tight against the shell I with the fastener shank I6 projecting through suitable apertures 22 there- The width of the plates and the number thereof that are circumferentially spaced around the internal periphery of the shell depends upon the diameter thereof and the size of the lifting elements 23 disposed therebetween. The lifting elements 23 preferably though not essentially consist of standard rails having side channels 24 and 25 that define the rail head 26 and a substantially wider base flange 21, a cross section thereof being of standard and conventional design with the channels 24-'25 serving to receive the side edges 28 and 29 of the liner plates II disposed therebetween to define a continuous liner comprising the plates II and the intermediary lifting elements 23.

Turning the nuts 2| down tight exteriorly of the shell in will serve to retain the lifting elements 23 in a predetermined assembled relation therewith for turning with the shell I6. With this arrangement, the lifting elements 23 are secured indirectly by the liner plates I I, and this affords the convenient replacement of either or both elements II23 comprising the internal liner of the shell I0. It should be observed that the lower longitudinal corners 33 and 3| of the liner plates II will engage the base 21 so as to effectively grip the base 21 therebetween to avoid the minutely ground materials confined interiorly of the liners II23 to find their way to the shell I0, thereby avoiding appreciable wear and injury thereto over long periods of operating use.

It will be observed that the shell I6 has its peripheral end regions 32 provided with a reinforcing collar 33 thatis welded or otherwise joined thereto to present an upstanding peripheral flange 34. The finished flat surface 35 of the collar flange 34 is in alignment with the peripheral edges 32 of the shell Ill to receive sub stantially circular end shell heads 36. The circumferential edge region of the heads 36 are provided with a plurality of circumferentially spaced apertures 31 that are in aligned registry with corresponding apertures 38 provided in the peripheral flange 34 of the shell I6, to receive fastener bolts 39 therethrough.

The fastener bolts 39 are provided with threaded nuts 46 that serve to securely attach the end shell heads 36 to the shell I6. As shown, the intake end head 36 is provided with an axial trunnion M, in this instance formed integral therewith, to serve as a housing mount. To this end, the trunnion 4| is provided with an annular groove 42 that cooperates with correspondingly sized and shaped bearings associated with standards on suitable bearing brackets for journalled support of the shell I6 through the medium of their end trunnions 4!. The intake trunnion M is provided with an enlarged axial bore 43 through which the shell I U is charged with the desired articles to be finished therein.

The tubular trunnion M is sized so that the attendant can have access to the interior of the shell I0 therethrough for the purpose of manipulating a plurality of end liner plates 44 attached to the interior surface of the circular shell end head plate 36. To this end, the end liner plates 44 or plurality of sectors have their inclined side edges 45 and 46 disposed along the radii of the end head or mounting plate 36 to define complemental sectors 44. The complemental sectors 44 are sized in a sufficient number to cover the entire exposed interior surface of the trunnion plate or head 36.

Because the converging sides 45 and 46 of the sectors 44 do not permit ready tilting or linear displacement of one relative to the other in the direction of the axis of the shell I6 and trunnion M to permit their removal for replacement purposes, it has been found desirable to interpose therebetween an insert plate 4! having parallel sides 48 and 49 preferably though not essentially extending for the entire border between the bore 43 and the truunion M and the internal diameter of the shell II] to render such readily movable by permitting the tiltable displacement thereof relative to its parallel edges 48-49.

In consequence thereof, the next adjacent sectors 5%! and 5I are shaped to serve as complements of the insert end liner plate 4'! to the end that their confronting edges Hand 53 are disposed parallel to the radial mediun line of the insert 41 so that the end liner plates 4'I-505I are complements of each other with their outside edges 54 and 55 conforming to and disposed along the radii to correspond with the converging sides 45-46 of the next adjacent standard end liner sectors 44.

It will be apparent, therefore, that the end liner insert 41 can be tilted or displaced radially toward the center of the trunnion 4| by the application of manual force through the bore 43 therein. After the end liner insert-41 has been removed in this manner, there is sufiicient space available to circumferentially displace the remaining end liner sectors 44505I so that they can be removed in their entirety for replacement after being excessively worn responsive to the extended use thereof.

It is to be noted that the end liner sectors 444I50-5I are attached to the end head or trunnion supporting plate 36 by means of threadedbolts 5e and 51; in this inst'ancetwo, that project" throughaligned apertures 58 -"-59 provided in e'a'chi of' the end liner' sectors 44 includ ing the liner'insert 41' and the complementaladjaeent'liner sectors 50'5|. The fastener bolts 56-51'prefer'ably have" tapered heads 60 seated in correspondingly shaped apertures 5859, in

this instance two, provided in the end liner sectors 4'4-4 '!56'5l. The bolt shanks project through corresponding aligned apertures 59 in the end head or trunnion supporting plate: 36 to receive fasteners such as threadednuts 6| that are" exteriorly accessible for securing. the end liners. 44--41-50-5| in position and. permit their removal.

It will be apparent,therefore, that the standard erid liner sectors 44 arerendered readily removable without entailing any appreciabletime, labor or expensebyproviding a.parallel side therebetween together with complemental sectors 5ll5l adjacent thereto. It isworthy of note-that the inner and outer radial ends 63 and 3 of the end liner sectors 4441-5fl5l are of arcuate configuration to conform with the circumference of the trunnion bore 43 and the interior diameter of the shell I respectively, so that they will serve to cover and provide a full liner for the interior surface of the shell head or trunnion supporting plate 36.

Inthe modified' embodiment shown inFigures -to '7 inclusive, the parts and shapes of the members are substantially identical with those described-in the preferred embodiment. However, the end liner insert 41' has parallel sides 48 and 59 for a substantial portion of its length. The

parallel sides 48'-49' merge with converging substantially radial edge portions 48" and 49" to constitute complements of correspondingly sized and shaped adjacent edges 5252" and 5 3"'5 3' "provided oncomplemental end liner sectors 50" and 5|. The end liner sectors 50'5l' that are adjacent to the insert 41 have. their edges 5'2-53 shaped to correspond with the adjacent edges 48'--48 and-49'49" so that in the removal of the end liner insert 41', it is tilted'to permit the converging side portions 48"49 to be displaced from adjacent alignment with the complemental end liner sectors 50'5I' to vpermit' withdrawal or displacement thereof toward the center along the parallel edge portions 52'-53.

To afford the tilting of the end liner insert 41 along a sufiicient arc to effect the total displacement of the converging edge portions 48"--49 thereof, a circumferential outer edge 64 of the end liner insert 41' is arcuately curved or bevelled as at 65 to provide the necessary clearance during the tilting displacement thereof to avoid contact or abut with the interior surface of the circular head or trunnion supporting plate 36 (Figure In a further modified embodiment shown in Figures 8 to 10, one of the standard liner sectors 44" is cut off proximate to their circumferential outer ends 64 to provide short parallel sides 52' and 53" that are shorter or no greater in length than the shortest distance between the interior of the shell 10 and its confronting liner plates ll (Figure 1). Consequently, the dust and pulverized substances removed from the articles during the grinding thereof responsive to the rotation of the shell II), will not become packed between the shell l0 and its liner plates ll, even though comparatively small corner openings 66 corners of one of theend liner sectors: 44:".

'l he reinoval of the' outer corner-s1 presented by the comparatively shortf parallel: sides-52 '-53 (Figure 9) in-conj'uncti'on with. the bevelled outer edge: 65 will: permit thepivoting of. theinsert liner: sectors 44" along:- the parallel edge portions 52"53"' thereof to: assume a position shown in dotted outline" inzFigure 10. The bevelled." outer circumferential surface 65' provides 'clearancerelative to the internal surface of the shell head or" trunnion supporting plate 36". It will be appreciated, therefore, that after the-end liner sectors: 44" with; its.- parallel outer edges El -53" have: been pivoted to a position affordingv clearance for the comparatively longer converging radial edge portions 45" and 46" thereof, the insert segments 44" canbe displaced inwardly in the direction of the axis of the shell ID to effect its complete removal.

The remaining liner'sectors 44" are of standard design conforming to the end liner' segments or sectors (Figure l) and 44 (Figure-5). This construction avoids necessity of having special complemental liner sectors adjacent to-the speciallyi constructed insert-41" (Figure 9): and still provides the desired; tiltable freedom for ready removal comparing favorably with the shapesof theinserts 41 (Figures-l to 4) and 41 (Figures 5 and 6).

Withthe teachingsof the invention described herein, it will be apparent thata verysimple' end liner expedient has been. provided to permit the ready removal thereof for replacement andto provide space adjacent the heads 36' so that the shell liners H can also be replaced with ease and without entailing extended time and labor heretofore required to perform these operations. Various changes may be made inthe embodiment of the invention herein specifically described without departing from the invention or sacrificing any of the advantages or features thereof; and nothingher'ein shall be'construed as limitations upon the invention, its concept or structural embodiment as to the whole or any part thereof except as'defined in the' appended claims.

I. In a grinding mill, the combination'with a cylindrical housing, of end head member detachably connectedto said housing, means-projecting from" said end head members to-rotatively support said housing, non-tiltable complemental edge contacting end liner sectors detachably associated with the interior surface of said end head members to define a continuous liner surface, a tiltable liner insert between two end liner sectors and having parallel edges extending for the entire length thereof, and non-tiltable liner sectors adjacent said tiltable liner insert and non-tiltable end liner sectors, said adjacent nontiltable liner sectors having edges complemental to the edges of said non-tiltable liner sectors and said tiltable liner insert for facilitating liner rerotatively support said housing; a plurality of complementary shaped end liner sectors extending radially between said housing and said supporting means and disposed in intimate edge contact with each other; a tiltable liner insert member interposed between adjacent sectors and and: 6-1' are presented by cutting off the: outer in edgecontact therewith, the side edges of said tiltable insert member and the proximate edges of said adjacent sectors having parallel portions, whereby said insertmember is adapted to be tilted upon an 'end edge as a fulcrum, said sectors and said insert member being of corresponding full length commensurate with the effective radii of said end enclosing head to define a continuous imperforate and unbroken end liner surface enclosure for said head to preclude the entrance of substances therebetween, said sectorsand said insert member being incapable of radial movement prior to .tilting said liner insert for removal thereof and adjacent sectors; and means detachably anchoring said plurality of sectors and said insert member in the positions named.

3. In a grinding mill, the combination with a cylindrical housing; of a head closing an end thereof; means projecting from said end head to rotatively support said housing; a, plurality of complementary shaped end liner sectors extending radially between saidhousing and said supporting means and disposed in intimate edge contact with each other; a tiltable liner insert member having substantial width interposed between adjacent spaced sectors and in edge contact therewith throughout their lengths, the side edges of said tiltable insert member and the proximate edges of said adjacent sectors having parallel portions extending inward fromtheir respective outer ends, whereby said insert member is adapted to be tilted upon an end edge as a fulcrum, said sectors and said insert member being of corresponding full length commensurate with the effective radii of said end enclosing head to define a continuous imperforate and unbroken end liner surface enclosure for said head to preclude the entrance of substances therebetween, said sectors and said insert member being incapable of radial movement prior to tilting said liner insert for removal thereof and adjacent sectors; and means detachably anchoring said plurality of sectors and said insert member in the positions named.

4. In a grinding mill, the combination with a cylindrical housing; of a head closing an end thereof; means projecting from said end head to rotatively support said housing; a plurality of complementary shaped end liner sectors extending radially between said housing and said supporting means and disposed in intimate edge contact with each other; a pair of said sectors spacedfrom eachother a substantial distance throughout their lengths; a tiltable liner insert member interposed between said spaced sectors in edge contact; therewith, theside edges of said tiltable insert member and the proximate edges of said spaced sectors having parallel portions, whereby said insert member is adapted to be tiltedupon an vend edge as a fulcrum, said sectors and said insert member being of corresponding full length commensurate With the effective radii of said: end enclosing head to define a continuous imperforate and unbrokenend liner surface enclosure for said head to preclude the entrance of substances therebetween, said sectors and said insert member being incapable of. radial movement prior to tilting said liner insert for removal thereof and adjacent sectors; and means detachably anchoring said plurality of sectors and said insertmember; in the positions named.

5. In a grinding mill, the combination with a cylindrical housing; of a head closing an end thereof; means projecting from said end head to rotatively support said housing; a plurality of complementary shaped end liner sectors extending radially between said housing and said supporting means and disposed in intimate edge contact with each other; a pair of said sectors spaced from each other a substantial distance throughout their lengths; a tiltable liner insert member having substantial width interposed between said spaced sectors in edge contact therewith throughout their lengths, the side edges of said tiltable insert member and the proximate edges of said spaced'sectors having parallel portions extending inward from their respective outer ends, the outer edge of said insert member provided with a bevelwhereby said insert member is adapted to be tilted upon its outer edge as a fulcrum, said sectors and said insert member being of corresponding full length commensurate with the effective radii of said end enclosing head to define a continuous imperforate and unbroken end liner surface enclosure for said head to pre- :lude thev entrance of substance therebetween, said sectors and said insert member being incapable of radial movement prior to tilting said liner insert for removal thereof andadjacent sectors; and means detachablyanchoring said plurality of sectors and said insert member in the positions named.

MAXWELL L. RAHNER. 

